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60⁰ + (x+15)⁰ + (3x+5) = 180⁰
4x + 80 = 180⁰
4x = 180⁰ - 80⁰
x = 100/ 4
x = 25⁰
sdt B = x+15
= 25+15
= 40⁰
180o - 60o = 120o
x + 3x = 120 - 5 - 15
4x = 100
x = 100/4 = 25 derajat
Sudut B = x + 5
= 25 derajat + 5 = 30 derajat
Sudut C (Tambahan aja) = 3x +5
= 25x3= 75 + 5 = 80 derajat
Sedangkan sudut A 60o
Jika dijumlahkan = 60 + 30 + 80 = 180 (Jumlah sudut di segitiga)
Jadikan yang terbaik ya :)